Feeding the 9 billion people expected to inhabit our planet by 2050 will be an unprecedented challenge. This special issue examines the obstacles to achieving global food security and some promising solutions. News articles take us into the fields, introducing farmers and researchers who are finding ways to boost harvests, especially in the developing world. Reviews, Perspectives, a special single-topic podcast, and an audio interview done by a high school intern provide a broader context for the causes and effects of food insecurity and point to paths to ending hunger.

We have little time to waste. Godfray et al. (p. 812) note that we have perhaps 40 years to radically transform agriculture, work out how to grow more food without exacerbating environmental problems, and simultaneously cope with climate change. Although estimates of food insecurity vary (Barrett et al., p. 825), the number of undernourished people already exceeds 1 billion; feeding this many people requires more than incremental changes (Federoff et al., p. 833).

CREDIT: KRISTINA STEFANOVA/USAID

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Special-issue Podcast [MP3]: Host Robert Frederick talks with contributors to this special section about how to measure food insecurity, the case for not eating meat, and radically rethinking agriculture

Audio Interview [MP3]: Science intern Lan-Vy Ngo, a senior at the Thomas Jefferson High School for Science and Technology, Alexandria, VA, talks with Dr. John Hoddinott, a senior policy fellow at IFPRI, about worldwide food security.

Scientists and engineers can make a big difference at every step from field to fork, from providing new strategies to smallholder farmers who must balance the needs of livestock and crops (Herrero et al., p. 822) to helping farmers get the most from fertilizers, water (Vince, p. 800), soil (Hvistendahl, p. 801), and seeds (Tester and Langridge, p. 818; Pennisi, p. 802). Innovation will be key to monitoring all stages of food production (Gebbers and Adamchuk, p. 828), from defending harvests against pests and disease (Pennisi, p. 804; Normile, pp. 806 and 807) to providing critical information and infrastructure (Stone, p. 808). And training enough scientists in all these areas will be essential (see associated Science Careers profiles at www.sciencecareers.org).

As Vince's profile (p. 798) of one Ugandan farmer illustrates, science and technology alone cannot guarantee food security. Economic, political, and psychological issues also play key roles. Yet there is optimism that a Green Revolution is possible in Africa (Ejeta, p. 831), although maintaining good governance throughout the world is crucial to success (see the associated Policy Forum by Smith et al., p. 784).

Much of this special issue focuses on how to increase the supply of basic staples. But Stokstad (p. 810) examines one idea for reducing demand: eating less meat; and Vogel (p. 811) highlights an alternative source of protein: insects. These alternatives are possibly unappetizing to many, but the quest for food security may require us all to reconsider our eating habits, particularly in view of the energy consumption and environmental costs that sustain those habits. As this special issue shows, science can help to make the choices less unpalatable.

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